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Did the core come from your car? If so you'll want to figure out why it blew in the first place when you fix it. It's usually from people installing an aftermarket tach incorrectly (connect the power line to the tach signal and *poof* out comes the magic blue smoke).
D463 is a diode. Your buddy can test it without removing it if he has a multimeter with a diode test function. It's not on the same circuit as Q457 and was probably not damaged. I can't tell what the p/n is for that diode, but any generic power diode will work. I would use something like a 1N4001, but Radio Shack will stock this, or scavenge one from another core. If you want to size D463 correctly just measure the resistance of the S.C.V solenoid, calculate the current, then size the diode to a little larger than that. It can't be all that much though, they didn't use a particularly large body diode. Your probably fine with any diode that is like 1A or more.
D463 is part of a circuit that isn't used on the B13, it's only used on the S13- it's the S.C.V swirl control valve solenoid driver circuit. If this circuit is damaged you probably wouldn't be able to tell driving the car- this controls the butterfly valve in the intake manifold on the S13 KA engine. If you've swapped to a S14 intake manifold/engine you don't have this anyway btw, this is a S13 thing only.
Last edited by Calum; 05-27-2009 at 11:14 AM.
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